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Solar incidence angle using google earth engine

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I am using the formula for solar incidence angle : cosd = sin(a)sin(b) + cos(a)cos(b)cos(c), where a = 0.409sin((2pi/365)*DOY - 1.39), b = latitude of region and c = hour angle(taken as constant for daily estimates) the code for the formula is not working. My code:

// Zoom to a location.

Map.setCenter(80.34, 26.42); // Center on IIT Kanpur.
var G = 1367;

//dayofyear
var sequence = ee.Array(ee.List.sequence(1, 365));

//calculating the relative earth sun distance
var dr = sequence.multiply(2).divide(365).multiply(Math.PI).cos().multiply(0.033).add(1);
print(dr);

//calculating the solar incidence angle
//getting latitude and longitude of the geometry
var l8 = ee.ImageCollection("LANDSAT/LC08/C01/T1_SR")
.filterBounds(geometry);
var first = ee.Image(l8.first()).clip(geometry);

// get image projection
var proj = first.select([0]).projection();
// get coordinates image
var latlon = ee.Image.pixelLonLat().reproject(proj);
Map.addLayer(first, {bands:['B1'], min:0, max:500}, 'Image');

// put each lon lat in a list
var coords = latlon.select(['longitude', 'latitude'])
.reduceRegion({
reducer: ee.Reducer.toList(),
geometry: geometry,
scale: 30
});
var lat1 = ee.List(coords.get('latitude'));
var lat = ee.Array(lat1);
var lon = ee.List(coords.get('longitude'));
// zip them. Example: zip([1, 3],[2, 4]) --> [[1, 2], [3,4]]
var point_list = lon.zip(lat);
//getting the declination angle and hour angle
var d = ee.Number(dr).multiply(2*Math.PI).divide(365).subtract(1.39).sin().multiply(0.409);
var w = 1; //assuming average of hour angle as 0 degrees
var cosd1 = d.sin();
var cosd2 = lat.sin();
var cosd3 = d.cos();
var cosd4 = lat.cos();
var cosd01 = cosd1.multiply(cosd2);
//print(cosd01);
var cosd02 = cosd3.multiply(cosd4);
var cosd = cosd01.add(cosd02);

javascript google-earth-engine

share

asked 15 mins ago

Bhumika OjhaBhumika Ojha

234

add a comment | 

0

I am using the formula for solar incidence angle : cosd = sin(a)sin(b) + cos(a)cos(b)cos(c), where a = 0.409sin((2pi/365)*DOY - 1.39), b = latitude of region and c = hour angle(taken as constant for daily estimates) the code for the formula is not working. My code:

// Zoom to a location.

Map.setCenter(80.34, 26.42); // Center on IIT Kanpur.
var G = 1367;

//dayofyear
var sequence = ee.Array(ee.List.sequence(1, 365));

//calculating the relative earth sun distance
var dr = sequence.multiply(2).divide(365).multiply(Math.PI).cos().multiply(0.033).add(1);
print(dr);

//calculating the solar incidence angle
//getting latitude and longitude of the geometry
var l8 = ee.ImageCollection("LANDSAT/LC08/C01/T1_SR")
.filterBounds(geometry);
var first = ee.Image(l8.first()).clip(geometry);

// get image projection
var proj = first.select([0]).projection();
// get coordinates image
var latlon = ee.Image.pixelLonLat().reproject(proj);
Map.addLayer(first, {bands:['B1'], min:0, max:500}, 'Image');

// put each lon lat in a list
var coords = latlon.select(['longitude', 'latitude'])
.reduceRegion({
reducer: ee.Reducer.toList(),
geometry: geometry,
scale: 30
});
var lat1 = ee.List(coords.get('latitude'));
var lat = ee.Array(lat1);
var lon = ee.List(coords.get('longitude'));
// zip them. Example: zip([1, 3],[2, 4]) --> [[1, 2], [3,4]]
var point_list = lon.zip(lat);
//getting the declination angle and hour angle
var d = ee.Number(dr).multiply(2*Math.PI).divide(365).subtract(1.39).sin().multiply(0.409);
var w = 1; //assuming average of hour angle as 0 degrees
var cosd1 = d.sin();
var cosd2 = lat.sin();
var cosd3 = d.cos();
var cosd4 = lat.cos();
var cosd01 = cosd1.multiply(cosd2);
//print(cosd01);
var cosd02 = cosd3.multiply(cosd4);
var cosd = cosd01.add(cosd02);

javascript google-earth-engine

share

asked 15 mins ago

Bhumika OjhaBhumika Ojha

234

add a comment | 

I am using the formula for solar incidence angle : cosd = sin(a)sin(b) + cos(a)cos(b)cos(c), where a = 0.409sin((2pi/365)*DOY - 1.39), b = latitude of region and c = hour angle(taken as constant for daily estimates) the code for the formula is not working. My code:

// Zoom to a location.

Map.setCenter(80.34, 26.42); // Center on IIT Kanpur.
var G = 1367;

//dayofyear
var sequence = ee.Array(ee.List.sequence(1, 365));

//calculating the relative earth sun distance
var dr = sequence.multiply(2).divide(365).multiply(Math.PI).cos().multiply(0.033).add(1);
print(dr);

//calculating the solar incidence angle
//getting latitude and longitude of the geometry
var l8 = ee.ImageCollection("LANDSAT/LC08/C01/T1_SR")
.filterBounds(geometry);
var first = ee.Image(l8.first()).clip(geometry);

// get image projection
var proj = first.select([0]).projection();
// get coordinates image
var latlon = ee.Image.pixelLonLat().reproject(proj);
Map.addLayer(first, {bands:['B1'], min:0, max:500}, 'Image');

// put each lon lat in a list
var coords = latlon.select(['longitude', 'latitude'])
.reduceRegion({
reducer: ee.Reducer.toList(),
geometry: geometry,
scale: 30
});
var lat1 = ee.List(coords.get('latitude'));
var lat = ee.Array(lat1);
var lon = ee.List(coords.get('longitude'));
// zip them. Example: zip([1, 3],[2, 4]) --> [[1, 2], [3,4]]
var point_list = lon.zip(lat);
//getting the declination angle and hour angle
var d = ee.Number(dr).multiply(2*Math.PI).divide(365).subtract(1.39).sin().multiply(0.409);
var w = 1; //assuming average of hour angle as 0 degrees
var cosd1 = d.sin();
var cosd2 = lat.sin();
var cosd3 = d.cos();
var cosd4 = lat.cos();
var cosd01 = cosd1.multiply(cosd2);
//print(cosd01);
var cosd02 = cosd3.multiply(cosd4);
var cosd = cosd01.add(cosd02);

javascript google-earth-engine

share

asked 15 mins ago

Bhumika OjhaBhumika Ojha

234

// Zoom to a location.

share

asked 15 mins ago

Bhumika OjhaBhumika Ojha

234

share

asked 15 mins ago

Bhumika OjhaBhumika Ojha

234

asked 15 mins ago

Bhumika OjhaBhumika Ojha

234

asked 15 mins ago

Bhumika OjhaBhumika Ojha

234